Mechanical properties and microstructural evolution of nanocrystalline titanium at elevated temperatures

被引：27
作者：
Shahmir, Hamed [1 ]
Pereira, Pedro Henrique R. [1 ]
Huang, Yi [1 ]
Langdon, Terence G. [1 ,2 ,3 ]
机构：
[1] Univ Southampton, Fac Engn & Environm, Mat Res Grp, Southampton SO17 1BJ, Hants, England
[2] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA
[3] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 669卷
基金：
欧洲研究理事会;
关键词：
High temperature behavior; High-pressure torsion; Nanostructured materials; Severe plastic deformation; Titanium; HIGH-PRESSURE TORSION; ULTRAFINE-GRAINED MATERIALS; PURE TITANIUM; DUCTILITY; STRENGTH; STRAIN; BEHAVIOR; PHASE; PARADOX; EXAMINE;
D O I：
10.1016/j.msea.2016.05.105
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
An investigation was initiated to study the mechanical properties and microstructural evolution of nanocrystalline titanium in the temperature range of 473-923 K after processing by high-pressure torsion (HPT) under a pressure of 5.0 GPa for up to 10 turns. The results show there is a significant improvement in both the tensile strength and the ductility in nanocrystalline Ti by comparison with coarse-grained (CG) Ti at elevated temperatures. The strength of HPT-processed Ti drops to that of CG Ti at temperatures above 773 K because of grain growth. An investigation of the mechanical behavior at elevated temperatures reveals an increasing-decreasing-increasing trend in the elongations to failure with increasing temperature. An elongation of > 130% was achieved both at 673 K and above 773 K for the HPT-processed samples and this was significantly larger than for the CG Ti. The highest measured elongation was similar to 200% for the HPT-processed sample tested at 923 K. A good combination of strength and elongation to failure was achieved in the temperature range of 573-773 K after HPT processing. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：358 / 366
页数：9
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